The kinematic motion (the idle standing motion) is tracked under physics . In other words, the character is executing the underlying idle pose, but the character is under physical simulation, which allows us to interact with it in order to perturb the motion on contact. We also trigger a collision event, and respond to it by automatically gazing at the object that has collided with the character. Note that the character appears to maintain balance because the root joint is artificially fixed in the environment. Learn more about SmartBody at http://projects.ict.usc.edu/smartbody/. Learn more about the USC Institute for Creative Technologies at http://ict.usc.edu/.